TV's favorite animated family, "The Simpsons," already has a hit movie, a video game on the way, a new theme-park ride and the title of America's longest-running sitcom. So what's next? Plenty, according to creator Matt Groening and his team of writers, who spoke to a crowd of more than 6,500 fans at the Comic-Con entertainment expo on Saturday -- just one day after "The Simpsons Movie" opened.

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